Submission #767545

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
767545	2023-06-26T20:29:34 Z	rainboy	Marriage questions (IZhO14_marriage)	C	86 / 100	1500 ms	1192 KB

marriage

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define NU	30000
#define NV	2000

int min(int a, int b) { return a < b ? a : b; }
int max(int a, int b) { return a > b ? a : b; }

int nu, nv;

int *eu[NV], eo[NV];

void append(int v, int u) {
	int o = eo[v]++;

	if (o >= 2 && (o & o - 1) == 0)
		eu[v] = (int *) realloc(eu[v], o * 2 * sizeof *eu[v]);
	eu[v][o] = u;
}

int l, u_;

int uu[NV], vv[NU], pp[NU]; char visited[NV];

void dfs(int v) {
	int o;

	visited[v] = 1;
	for (o = eo[v]; o--; ) {
		int u = eu[v][o], w = vv[u];

		if (u <= l)
			continue;
		if (w == -1 || !visited[w]) {
			pp[u] = v;
			if (w == -1)
				u_ = min(u_, u);
			else
				dfs(w);
		}
	}
}

int main() {
	int m, u, v, v_, r, ans;

	scanf("%d%d%d", &nu, &nv, &m);
	for (v = 0; v < nv; v++)
		eu[v] = (int *) malloc(2 * sizeof *eu[v]);
	while (m--) {
		scanf("%d%d", &u, &v), u--, v--;
		append(v, u);
	}
	memset(uu, -1, nv * sizeof *uu), memset(vv, -1, nu * sizeof *vv);
	for (v = 0; v < nv; v++) {
		memset(visited, 0, nv * sizeof *visited);
		l = -1, u_ = nu, dfs(v);
		u = u_;
		while (1) {
			v_ = pp[u], u_ = uu[v_];
			uu[v_] = u, vv[u] = v_;
			u = u_;
			if (v_ == v)
				break;
		}
	}
	r = -1;
	for (v = 0; v < nv; v++)
		r = max(r, uu[v]);
	ans = 0;
	for (u = 0; u < nu; u++) {
		ans += nu - r;
		if ((v = vv[u]) != -1) {
			memset(visited, 0, nv * sizeof *visited);
			l = u, u_ = nu, dfs(v);
			if (u_ == nu)
				break;
			r = max(r, u_);
			u = u_;
			while (1) {
				v_ = pp[u], u_ = uu[v_];
				uu[v_] = u, vv[u] = v_;
				u = u_;
				if (v_ == v)
					break;
			}
			vv[u] = -1;
		}
	}
	printf("%d\n", ans);
	return 0;
}

Compilation message

marriage.c: In function 'append':
marriage.c:18:23: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
   18 |  if (o >= 2 && (o & o - 1) == 0)
      |                     ~~^~~
marriage.c: In function 'main':
marriage.c:49:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   49 |  scanf("%d%d%d", &nu, &nv, &m);
      |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
marriage.c:53:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   53 |   scanf("%d%d", &u, &v), u--, v--;
      |   ^~~~~~~~~~~~~~~~~~~~~

Subtask #1

86.0 / 100.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	212 KB	Output is correct
2	Correct	0 ms	212 KB	Output is correct
3	Correct	0 ms	212 KB	Output is correct
4	Correct	0 ms	212 KB	Output is correct
5	Correct	0 ms	212 KB	Output is correct
6	Correct	0 ms	212 KB	Output is correct
7	Correct	0 ms	212 KB	Output is correct
8	Correct	0 ms	212 KB	Output is correct
9	Correct	0 ms	212 KB	Output is correct
10	Correct	0 ms	212 KB	Output is correct
11	Correct	0 ms	212 KB	Output is correct
12	Execution timed out	1582 ms	212 KB	Time limit exceeded
13	Correct	0 ms	212 KB	Output is correct
14	Correct	0 ms	212 KB	Output is correct
15	Correct	0 ms	212 KB	Output is correct
16	Correct	0 ms	212 KB	Output is correct
17	Correct	0 ms	212 KB	Output is correct
18	Correct	0 ms	212 KB	Output is correct
19	Correct	2 ms	212 KB	Output is correct
20	Correct	1 ms	212 KB	Output is correct
21	Execution timed out	1586 ms	212 KB	Time limit exceeded
22	Correct	1 ms	212 KB	Output is correct
23	Correct	1 ms	212 KB	Output is correct
24	Correct	1 ms	212 KB	Output is correct
25	Correct	30 ms	416 KB	Output is correct
26	Correct	5 ms	212 KB	Output is correct
27	Execution timed out	1591 ms	212 KB	Time limit exceeded
28	Correct	1 ms	212 KB	Output is correct
29	Correct	4 ms	340 KB	Output is correct
30	Correct	3 ms	340 KB	Output is correct
31	Correct	230 ms	632 KB	Output is correct
32	Correct	13 ms	380 KB	Output is correct
33	Execution timed out	1576 ms	212 KB	Time limit exceeded
34	Correct	2 ms	340 KB	Output is correct
35	Correct	41 ms	844 KB	Output is correct
36	Correct	29 ms	852 KB	Output is correct
37	Correct	678 ms	708 KB	Output is correct
38	Correct	26 ms	860 KB	Output is correct
39	Correct	28 ms	512 KB	Output is correct
40	Execution timed out	1593 ms	424 KB	Time limit exceeded
41	Correct	13 ms	596 KB	Output is correct
42	Correct	7 ms	512 KB	Output is correct
43	Correct	14 ms	724 KB	Output is correct
44	Correct	22 ms	980 KB	Output is correct
45	Correct	9 ms	724 KB	Output is correct
46	Execution timed out	1582 ms	1172 KB	Time limit exceeded
47	Correct	27 ms	1108 KB	Output is correct
48	Correct	23 ms	1124 KB	Output is correct
49	Execution timed out	1570 ms	1192 KB	Time limit exceeded
50	Correct	28 ms	596 KB	Output is correct